tranny problems

my 84 k5 shakes(like going over a washboard dirt doad) when the tranny(700r4) shifts from 1st to 2nd. i've been told its the clutches slipping, or the torque converter going bad. the tranny is allegedly just a year old. i also noticed on the highway when i'm in overdrive, going anywhere from 60-80, the truck seems to slow and go as if the wind was blowing hard enough to slow it down. could that be the torque converter going bad? the vibration is only between 1st and 2nd gear, what's my problem? any suggestions on what it is, and what's best to do about it?
thanks in advance..........Kelboski

i would start with your fluid,if its dark and smells burnt then change it with fresh fluid and filter.if that helps and you dont get the vibrations then its an internal problem.if all else fails take it to your local tranny shop for a free inspection,let them figure it out then you go home and fix it youself...it can be a lot of different things,700r4 trannys are not the best trannys to have,factory ones anyway.....good luck

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